As soon as I downloaded LR6 CC (after using LR 5.7 licensed version) the develop module would visually glitch every time I changed a setting and many times either a) the setting I was trying to use or b) reset all of the setting. A Google search shows I'm not the only person having this issue. PC, Windows 7.
At least at the moment it appears to be better if I set the preferences to not access the graphics processor under Performance. At least it isn't resetting the settings at the moment...it still visually glitches.
The glitching and resetting of settings has stopped now that the GPU is not enabled in LR6.